I'm a huge fan of dark scary places.. it's probably why I love paranormal and fantasy books. There is a world where things aren't always as they seem. Dark Alleys are either just as scary as real life or the place where to wonderfully tempting vampires have a meet each night before they go and stalk their pray.
I love horror books set in dark scary towns that have lots of foreboding in them.. It's always a fun place to be .. well not for the characters but for the readers. I love the way a setting of a book can set the mood and make or break a story really.